Anritsu 3GPP, Measurement Manual, Page: 153 / 244

3GPP MG PN: 10580-00234 Rev. Y 6-1
Chapter 6 — TD-LTE Signal Analyzer
6-1 Introduction
The Time-Division Long Term Evolution (TD-LTE) Signal Analyzer offers three
measurement options:
• RF Measurements
The following display types are provided for RF measurements: Channel Spectrum
display, Power vs. Time, ACLR display, Spectral Emission Mask display, and the RF
Summary table.
• Modulation Measurements
Modulation measurements can be viewed in Power vs Resource Block, Constellation
display, Control Channel Power display, or the Modulation Summary table.
• Over-The-Air (OTA) Measurements
Over-the-Air measurements include Scanner, Tx Test, Coverage Mapping, and Carrier
Aggregation. EMF measurements are available with Option 444.
6-2 General Measurement Setups
Please refer to the User Guide for selecting the TD-LTE Signal Analyzer mode, setting up
frequency, amplitude, and file management. In addition, perform the following TD-LTE
specific setup procedures.
1. Press the
Setup
main menu key.
2. Press the
BW
submenu key to open the Select Bandwidth list. Select the desired
Bandwidth with the arrow keys or rotary knob and press
Enter
.
3. Press the
EVM Max Hold
submenu key
On
to display both the Maximum EVM value
since Reset and the current measured value. This applies to EVM RMS and Peak
values. Selecting
Off
displays only the current measured value.
4. Press the
EVM Mode
submenu key to select either
Auto
or
PBCH Only
. Selecting Auto
measures Physical Downlink Shared Channel (PDSCH) if data is available, otherwise
it measures Physical Broadcast Channel (PBCH), a control channel that carries a
broadcast message. Selecting PBCH Only forces a PBCH measurement.
5. Press the
Trigger
submenu key. The Trigger menu opens to set Trigger Source and
Trigger Polarity. For
Trigger Source
, select
No Trig
or
Ext
. Then select the trigger edge
by setting
Trigger Polarity
to
Rising
or
Falling
. Press the
Back
submenu key to return to
the Setup menu.
6. (Not applicable for all models) Press the
Ext. Ref. Freq
submenu key to configure the
instrument using an external reference frequency. The External Reference Frequency
list opens. Highlight the desired frequency and press
Enter
.
Note
The Constellation will show a QPSK constellation when PBCH is being measured.
PBCH Only mode is especially useful when making measurements over the air
under conditions where the transmitted data uses MIMO.